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Features: 1.Each item is qualify checked with a unique Manufacturing Part Number label on the inner package,in order to confirm if it is authentic item sold by our store. 2.Any question,please contact and send us the MPN label information. 3.Made of brass, long time service. 4.The transmission structure of shaft gear wheel is simple, compact, small volume and light weight. 5.Shaft Z1=1, turn a round of gear teeth, can get a large transmission ratio, generally in the power transmission, the transmission ratio I=10-80, like big transmission ratio, if use with gear transmission, will need to take the multi-stage transmission. Specifications: Material: Brass Modulus: 0.5 Reduction Ratio: 1:30 Brand name: Yibuy Weight: 25g Gear Wheel: Teeth:30 Teeth Dia:16.2MM Height:12MM/0.47 Inch Outer Diameter:16MM/0.63 Inch Hole Diameter:4MM/0.16 Inch Step Size:12x7MM/0.47x0.27 Inch ( Dia x H) Overall Size:12x16x4MM/0.47x0.63x0.12 Inch( H x OD x ID) Gear Shaft: Height:20MM/0.79 Inch Outer Diameter:11.7MM/0.46 Inch Inner Diameter:6MM/0.24 Inch Size:20x11.7x6MM/0.79x0.46x0.24 Inch( H x OD x ID) Package include: 1 x Brass Wheel 1 x Brass Gear Shaft 2 x Screws